EP0102738A1 - Structures flexibles, stratifiées, d'emballage à couches multiples et emballages tels que petits sacs faits de celles-ci - Google Patents

Structures flexibles, stratifiées, d'emballage à couches multiples et emballages tels que petits sacs faits de celles-ci Download PDF

Info

Publication number
EP0102738A1
EP0102738A1 EP83304337A EP83304337A EP0102738A1 EP 0102738 A1 EP0102738 A1 EP 0102738A1 EP 83304337 A EP83304337 A EP 83304337A EP 83304337 A EP83304337 A EP 83304337A EP 0102738 A1 EP0102738 A1 EP 0102738A1
Authority
EP
European Patent Office
Prior art keywords
layer
density polyethylene
layers
low density
linear low
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP83304337A
Other languages
German (de)
English (en)
Inventor
Ronald C. Christensen
Roger P. Genske
Dennis E. Kester
William F. Ossian
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Primerica Inc
Original Assignee
American Can Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by American Can Co filed Critical American Can Co
Publication of EP0102738A1 publication Critical patent/EP0102738A1/fr
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • B29C48/185—Articles comprising two or more components, e.g. co-extruded layers the components being layers comprising six or more components, i.e. each component being counted once for each time it is present, e.g. in a layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B32B27/322—Layered products comprising a layer of synthetic resin comprising polyolefins comprising halogenated polyolefins, e.g. PTFE
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D75/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes, or webs of flexible sheet material, e.g. in folded wrappers
    • B65D75/26—Articles or materials wholly enclosed in laminated sheets or wrapper blanks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/31—Heat sealable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2323/00—Polyalkenes
    • B32B2323/04—Polyethylene
    • B32B2323/046—LDPE, i.e. low density polyethylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00—Containers; Receptacles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2553/00—Packaging equipment or accessories not otherwise provided for
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
    • Y10T428/1334—Nonself-supporting tubular film or bag [e.g., pouch, envelope, packet, etc.]
    • Y10T428/1341—Contains vapor or gas barrier, polymer derived from vinyl chloride or vinylidene chloride, or polymer containing a vinyl alcohol unit
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31725—Of polyamide
    • Y10T428/31739—Nylon type
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31725—Of polyamide
    • Y10T428/31739—Nylon type
    • Y10T428/31743—Next to addition polymer from unsaturated monomer[s]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31725—Of polyamide
    • Y10T428/31739—Nylon type
    • Y10T428/31743—Next to addition polymer from unsaturated monomer[s]
    • Y10T428/31746—Polymer of monoethylenically unsaturated hydrocarbon
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31855—Of addition polymer from unsaturated monomers
    • Y10T428/31909—Next to second addition polymer from unsaturated monomers
    • Y10T428/31913—Monoolefin polymer

Definitions

  • the present invention relates to laminated multiple layer flexible packaging structures and packages such as pouches made therefrom.
  • Heat sealed pouches made from flexible sheet stock are now being used for packaging certain products which are stored under sterile conditions. Typical products packaged and used in this manner are certain foods and medical supplies.
  • the packaging thus used is known generally as-a retort pouch.
  • the first generation of retort pouches included certain adhesives, which were used for laminating the various layers.
  • the adhesives had some residual monomer moieties present after fully cured. These structures were rejected by government authorities because of the perceived possibility of toxic monomers migrating into a packaged food product.
  • retort pouch structures have been made by various methods of adhering the layers to each other by one or more of several extrusion processes. Illustrative of these processes is one taught in US-A 4,190,477.
  • biaxially oriented polyester is first adhesively mounted to a metal foil, on what is to be the outside of the package. This use of adhesive is considered acceptable because the foil serves as an effective barrier to the migration of residual monomer from the adhesive, to the inside of the package.
  • a polypropylene-based heat sealing layer is separately extruded.
  • a primer is applied to the side of the foil opposite the polyester.
  • sealant layer and the primed foil are extrusion laminated together using an extrusion grade polypropylene-based polymer as an extrusion laminant.
  • packages In retort pouch packaging, packages must be subjected to sterilizing conditions of relatively high temperature after being filled with products and sealed. Typical sterilizing conditions range in severity up to about 275°F (135°C) with residence times at that temperature of as much as 30 minutes or more. Such conditions impose severe.stresses on the packages. Many packaging structures provide excellent protection for the package contents, but only for less severe conditions. For example, relatively simple packaging structures for packages requiring the ability to withstand boiling water, at 212°F (100°C) are readily available from several suppliers. When sterilizing conditions are required, however, most of these packages fail to survive the processing. Typically, problems are encountered owing to excessive weakening or failure of the heat seals about the periphery of the pouch. Also certain weaknesses or separations may develop between the layers in the multiple layer sheet structure.
  • a transparent packaging film is highly desirable therefore, and foil-based films are less desirable.
  • metal foil be specifically excluded from the structure so that the completed package can be penetrated by microwave energy, e.g. for cooking food contained in the package.
  • the sealant, or inner layer of the pouch is believed to be, in almost all cases, based on polypropylene, and in some cases, propylene copolymers. While pouches made with the propylene based polymers are functionally capable of surviving the. sterilizing process, their sheet structure is relatively brittle and hard. Thus the pouches are somewhat susceptible to cracking and crazing if subjected to rough handling. There are also some limited problems with weakening of interlayer adhesion between the layers. Once the interlayer adhesion is weakened, the pouch is, of course, subject to further damage by handling which an unweakened pouch could normally tolerate.
  • an improved sealant layer structure should be less brittle than propylene-based sealants. It should also survive the sterilizing process with good heat seal strength about the pouch periphery. Moreover, in the package structure the interlayer adhesion should remain strong enough that the several layers remain intact as a unit and mutually support each other under stress, particularly after the sterilization process.
  • the present invention provides a laminated, multiple-layer flexible packaging structure, wherein the layers are firmly adhered to each other in face-to-face contact, the structure being characterised by the following layers, being in order,
  • an additional layer of linear low density polyethylene is positioned between the second and third layers.
  • the second layer is a blend of O% to 80% medium density polyethylene and 20% to 100% linear low density polyethylene.
  • the additional layer may contain 0% to 80% medium density polyethylene and 20% to 100% linear low density polyethylene.
  • a subassembly is first made including all but the first and second layers, preferably by a coextrusion process.
  • the first layer is then extrusion laminated to the subassembly using the second layer as the extrusion laminant.
  • FIGURE 1 illustrates a pouch such as is the desired packaging structure of this invention.
  • a cross-section of a portion of the pouch is shown in FIGURE 2.
  • the sheet material used to make the pouch is seen in FIGURE 3.
  • the FIGURE 2 construction consists of two sheet elements of the FIGURE 3 construction in face to face relation with the layers 12 joined at the one edge in a heat seal.
  • the pouch is formed by arranging the two sheet elements in face to face relationship and forming heat seals 19 about the common periphery.
  • the pouch may be formed by folding a sheet element onto itself and forming heat seals about the edges. Either way the formed pouch appears as shown in FIGURE 1.
  • the pouch is open at one end to receive its filling, after which this end is closed by heat sealing.
  • layer 12 is a heat sealable layer comprised of linear low density polyethylene.
  • Layer 14 is an adhesive or tie, layer based on linear low density polyethylene.
  • Layer 16 is also an adhesive, or tie, layer and is an anhydride modified medium density polyethylene.
  • Layers 18 and 22 are nylon.
  • Layer 20 is an ethylene vinyl alcohol copolymer.
  • the formed pouch structure thus has an inner heat seal layer of linear low density polyethylene and an outer surface of nylon.
  • the intermediate layers serve the functions of strengthening the structure, providing certain barrier properties, and bonding the structure together.
  • the formed pouch is intended for packaging products which are subjected to a sterilizing process after the product is in the package and the package - is sealed.
  • a common sterilizing process is known as autoclave, or retort, processing.
  • closed and sealed packages are placed in a pressure vessel.
  • Steam and water are then introduced into the vessel at abovt 275°F (135°C) at a sufficiently high pressure to permit maintenance of the desired temperature.
  • the temperature and pressure are usually maintained for about 30 minutes.
  • the pressure vessel is cooled and the pressure temporarily maintained until the packages cool internally. Finally the pressure is released and the processed packages are removed.
  • the heat seal layer 12 significantly influences the physical properties of the pouch because there is physically more material in layer l2 than in any other single layer.
  • the composition of layer 12 may be any of the polymers or copolymers known as linear low density polyethylene. These polymers are relatively extensible and elastic in nature, giving the pouch a degree of resilience in absorbing physical abuse.
  • Layer 14 has a composition based on linear low density polyethylene, and may contain up to 80% medium density polyethylene.
  • the medium density polyethylene may include anhydride modifiers such as maleic anhydride.
  • the composition of layer 14 serves as a tie layer to bond layer 12 to the remainder of the structure.
  • Layer 16 is an anhydride modified medium density polyethylene.
  • One such preferred material, which is modified with maleic anhydride, is available from Mitsui Company of Japan as Admer NF500.
  • nylons in layers 18 and 22 usually are the same composition, although the user may satisfactorily choose to use different nylon polymers.
  • Preferred nylon compositions are nylon 6 and blends of nylon 6 with nylon 12. In the blends, no more than 50% of the composition may be nylon 12, since concentrations over this amount yield pouches susceptible to failing abuse testing after retort processing.
  • Nylon layers 18 and 22 provide abuse resistance as their primary function. Since nylon polymers can absorb a lot of abuse, they protect the more physically sensitive layers of the pouch structure. Layer 22 is specifically protective of the thin, brittle, and fragile layer 20 of ethylene vinyl alcohol. The combination of layers 18 and 22 serves to encapsulate layer 20 during the extrusion process, and thus provides a degree of thermal protection in that role.
  • Layer 20 of ethylene vinyl alcohol copolymer provides a barrier to passage of oxygen through the pouch structure.
  • Any of the ethylene vinyl alcohols may be used, so long as at least 90% of the ester units have been hydrolyzed to the alcohol form. While some ethylene vinyl alcohol copolymers may provide an adequate barrier with less than 90 % hydrolysis, this normally is not the case, and the composition of layer 20 must be chosen such that the needed barrier is provided. Because the vinyl alcohol is so brittle, it is sometimes desirable to incorporate plasticizing agents into layer 20. This is entirely acceptable so long as an adequate oxygen barrier property is . preserved.
  • FIGURE 4 shows a cross-section of an alternate sheet structure of the invention.
  • the FIGURE 4 structure is the same as the FIGURE 3 structure except that it incorporates one additional layer 24, containing linear low density polyethylene, between layers 14 and 16.
  • Layer 24 may optionally be a blend composition of 0% to 80% medium density polyethylene and 20% to 100% linear low density polyethylene.
  • the composition of layer 14 preferably has a high proportion of linear low density polyethylene, generally greater than 50% by weight.
  • the compositions of the respective layers may, but normally will not, be the.same.
  • the first subassembly includes layers 16, 18, 20, 22 and 24.
  • the second subassembly is layer 12.
  • the structure is then fully assembled by joining layers 12 and 24 in an extrusion lamination process using the layer 14 composition as the extrusion laminant.
  • the process requirements for layer 24, for coextrusion may differ significantly from the process requirement for layer 14, for extrusion lamination.
  • different specific polymers may be selected.
  • minor adjustments may be made without departing from the scope of the invention.
  • Layers 14 and 24 are intentionally defined with a broad range of possible blend compositions such that the composition for each structure may be tailored for best performance in that particular structure.
  • the first important parameter to be considered is that the two components, when blended, must form a compatible polymeric mixture, which they do.
  • each of the components of the blend contributes to forming good bonding with the adjacent layer of like polymeric composition.
  • the medium density polyethylene component of the blend contributes the preponderance of the bond forming capability between layer 14 and layer 16 in the FIGURE 3 structure.
  • the linear low density polyethylene component of the blend contributes the preponderance of the bond forming capability between layer 14 and layer 12 which is composed of linear low density polyethylene.
  • the preferred composition for layer 14 is 40% to 60% medium density polyethylene and 60% to 40% linear low density polyethylene.
  • a composition highly satisfactory for a variety of structures of this invention is 50% medium density polyethylene and 50% linear low density polyethylene.
  • Blends high in linear low density polyethylene are used for layer 14, while blends high in medium density polyethylene are used for layer 24; so that each of layers 14 and 24:may serve to bond to its adjacent layer, either 12 or 16.
  • the blend composition of either layer may be adjusted for maximum benefit either by adjusting the blend ratio, by selecting an alternate polymer component of linear low density polyethylene, or medium density polyethylene, or by using both techniques. For example, using the general structure of FIGURE 3, if the bond between layers 14 and 16 is weaker than desired, the composition of layer 14 may be adjusted.
  • One alternative is to increase the proportion of medium density polyethylene in the layer 14 composition.
  • Another alternative is to choose an alternate specific polymer for use as the medium density polyethylene component of the blend.
  • compositions of layers 14 and 24 be selected such that there is good compatibility physically and chemically between the compositions of the layers at their common interfaces; this to encourage intimate contact and bond development between the respective components of the layers.
  • Sheet structures of this invention generally range in thickness from about 5 mils up to about 15 mils (0.13 to 0.38 mm).
  • the thickest layer is usually the sealant layer and the thinnest layers usually are the tie layers and the ethylene vinyl alcohol layer.
  • the sheet structures of this.invention may be made by conventional processes and combinations of processes.
  • the process and its sequences may be selected according to the equipment and polymers available.
  • the specific structure selected and the compositions of layer 14, and optional layer 24, will be at least partially dependent on the process and its sequences.
  • FIGURE 3 As an example structure, layers 16, 18, 20 and 22 are coextruded as a four-layer film. The structure is completed by extrusion coating or coextrusion coating layers 14 and 12 onto layer 16.
  • compositions of layers 12 and, particularly, 14 must be coselected so that the processing temperatures and melt flow properties are compatible to extrusion coating, coextrusion, and coextrusion coating, as the specific process may require.
  • layer 14 certain compromises, such as bond strength between layers 14 and 16, may have to be made in its composition, albeit within the invention, in order to accommodate the coextrusion and extrusion coating processes.
  • layer 12 is extruded as a separate film.
  • Layer 12 and the combination of layers 16, 18, 20 and 22 are simultaneously pulled through a nip and layer 14 is extruded into the nip between layers 12 and 16 in an extrusion lamination.process.
  • layers 12 and 14 are coextruded and the combinations of layers 12 and 14, and 16, 18, 20 and 22 are pulled through a hot nip from opposite sides, and a combination of heat and pressure are applied to effect the formation of the bond between layers 14 and 16.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Laminated Bodies (AREA)
  • Bag Frames (AREA)
  • Wrappers (AREA)
EP83304337A 1982-08-06 1983-07-27 Structures flexibles, stratifiées, d'emballage à couches multiples et emballages tels que petits sacs faits de celles-ci Withdrawn EP0102738A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US06/405,717 US4407873A (en) 1982-08-06 1982-08-06 Retortable packaging structure
US405717 1982-08-06

Publications (1)

Publication Number Publication Date
EP0102738A1 true EP0102738A1 (fr) 1984-03-14

Family

ID=23604920

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83304337A Withdrawn EP0102738A1 (fr) 1982-08-06 1983-07-27 Structures flexibles, stratifiées, d'emballage à couches multiples et emballages tels que petits sacs faits de celles-ci

Country Status (6)

Country Link
US (1) US4407873A (fr)
EP (1) EP0102738A1 (fr)
JP (1) JPS5981168A (fr)
AU (1) AU1734883A (fr)
DK (1) DK359483A (fr)
ES (1) ES282208U (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0176229A1 (fr) * 1984-08-23 1986-04-02 Toyo Seikan Kaisha Limited Récipient en polyester, multicouche, étanche aux gaz, étiré
EP0613774A1 (fr) * 1993-03-04 1994-09-07 Wolff Walsrode Aktiengesellschaft Feuille multicouche, adaptée à l'emboutissage, contenant du polyamide avec une résistance améliorée au perçage

Families Citing this family (75)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4770944A (en) * 1979-12-10 1988-09-13 American Can Company Polymeric structure having improved barrier properties and method of making same
US4588648A (en) * 1981-02-20 1986-05-13 American Can Company Multiple layer plastic film having polypropylene adhered to nylon
US4445550B1 (en) * 1982-08-20 1999-03-09 Scholle Corp Flexible walled container having membrane fitment for use with aseptic filling apparatus
US4469742A (en) * 1983-01-31 1984-09-04 W. R. Grace & Co., Cryovac Div. Pasteurizable, cook-in shrink film
CA1241886A (fr) * 1983-04-13 1988-09-13 Peter W. Field Sac a lavement
US4501798A (en) * 1983-05-05 1985-02-26 American Can Company Unbalanced oriented multiple layer film
US5055355A (en) * 1983-08-01 1991-10-08 Allied-Signal Inc. Oriented film laminates of polyamides and ethylene vinyl alcohol copolymers
US4617241A (en) * 1984-01-23 1986-10-14 W. R. Grace & Co., Cryovac Div. Linear polyethylene stretch/shrink films
US4590124A (en) * 1984-05-10 1986-05-20 W. R. Grace & Co., Cryovac Div. Storm window film
US4551380A (en) * 1984-05-10 1985-11-05 W. R. Grace & Co., Cryovac Div. Oriented heat-sealable multilayer packaging film
US4514465A (en) * 1984-05-30 1985-04-30 W. R. Grace & Co., Cryovac Div. Storm window film comprising at least five layers
US4615926A (en) * 1984-07-20 1986-10-07 American Can Company Film and package having strong seals and a modified ply-separation opening
US4654240A (en) * 1984-09-28 1987-03-31 Baxter Travenol Laboratories, Inc. Laminate film for flexible containers
US4686125A (en) * 1984-09-28 1987-08-11 Baxter Travenol Laboratories, Inc. Film laminate for sterile flexible containers
US4692361A (en) * 1984-09-28 1987-09-08 Baxter Travenol Laboratories, Inc. Film laminate with gas barrier for sterile flexible containers
US4746562A (en) * 1986-02-28 1988-05-24 W. R. Grace & Co., Cryovac Div. Packaging film
US4753700A (en) * 1986-02-28 1988-06-28 W. R. Grace & Co., Cryovac Div. Packaging film
US4755419A (en) * 1986-03-21 1988-07-05 W. R. Grace & Co., Cryovac Div. Oxygen barrier oriented shrink film
US5004647A (en) * 1986-03-21 1991-04-02 W. R. Grace & Co.-Conn. Oxygen barrier biaxially oriented film
US4668571A (en) * 1986-05-02 1987-05-26 The Dow Chemical Company Coextrustion tie layer and process for producing such tie layer
US4729926A (en) * 1986-05-16 1988-03-08 W. R. Grace & Co., Cryovac Div. Packaging material for long-term storage of shelf stable food products and method of making same
CA1311593C (fr) * 1986-05-16 1992-12-22 Randal M. Koteles Materiau d'emballage pour l'entreposage a long terme de produits de longue conservation
US4735855A (en) * 1986-08-04 1988-04-05 W. R. Grace & Co., Cryovac Div. Thermoformable laminate
US4927677A (en) * 1987-04-28 1990-05-22 Nikka Co., Ltd. Composite materials and top materials for retort container
USRE33376E (en) * 1987-05-29 1990-10-09 International Paper Company Non-foil composite structures for packaging juice
US4789575A (en) * 1987-05-29 1988-12-06 International Paper Company Non-foil composite structures for packaging juice
US4851290A (en) * 1988-01-06 1989-07-25 Viskase Corporation Multilayer thermoplastic film
US4928474A (en) * 1988-09-21 1990-05-29 W. R. Grace & Co.-Conn. Oxygen-barrier retort pouch
DE4029405A1 (de) * 1990-03-16 1991-09-19 Degussa Formkoerper zur waermedaemmung
CA2040064C (fr) * 1990-11-16 2000-06-13 Gloria G. Toney Pellicule de protection offrant une flexibilite accrue pour l'empaquetage de fromage
TR25085A (tr) * 1991-03-04 1992-11-01 Degussa Ag Dallare Ind Limited ISI IZOLASYONU ICIN KALIPLANMIS ELEMAN YATAY VE DIKEY HAREKET EDEBILEN PENCERE SISTEMLERISERAMIK PARCALARIN VE BILHASSA TUGLALARIN SIRLANMASI ICIN YüKSEK KRISTALIZASYON HIZINA SAHIP CAM SER ICIN YAPI DONANIMI AMIK BILESIM
US6149993A (en) * 1991-06-26 2000-11-21 Westvaco Corporation Oxygen and flavor barrier laminate including amorphous nylon
CA2070349C (fr) * 1991-06-26 2002-03-19 Christopher J. Parks Produit d'emballage lamine, incluant du nylon amorphe, offrant une barriere contre la penetration de l'oxygene et la perte des saveurs
US5306533A (en) * 1992-04-27 1994-04-26 Combibloc, Inc. Oxygen barrier container
DE9219105U1 (de) * 1992-10-31 1998-03-05 Klocke Verpackungs Service Behälter zur Aufnahme von aromatischen Substanzen
US6964798B2 (en) 1993-11-16 2005-11-15 Baxter International Inc. Multi-layered polymer based thin film structure for medical grade products
CN1128005A (zh) * 1994-03-15 1996-07-31 株式会社大塚制药工场 防污染密封膜及其制品
US6682825B1 (en) * 1994-06-06 2004-01-27 Cryovac, Inc. Films having enhanced sealing characteristics and packages containing same
NZ272328A (en) 1994-07-13 1997-05-26 Grace W R & Co Heat-shrinkable multilayer packaging film having polyamide internal layers
US5707750A (en) * 1994-10-24 1998-01-13 Alliedsignal Inc. Retortable, high oxygen barrier polymeric films
DE19510136A1 (de) * 1995-03-21 1996-09-26 Wolff Walsrode Ag Klebstofffreie, sterilisationsfeste Mehrschichtfolie für Verpackungsanwendungen
CN1077028C (zh) * 1995-06-07 2002-01-02 巴克斯特国际有限公司 多层的、无卤素的、可热压处理的屏障膜
US5874155A (en) * 1995-06-07 1999-02-23 American National Can Company Easy-opening flexible packaging laminates and packaging materials made therefrom
US6068933A (en) * 1996-02-15 2000-05-30 American National Can Company Thermoformable multilayer polymeric film
CH692846A5 (it) 1997-02-24 2002-11-29 Baxter Biotech Tech Sarl Film a più strati coestrusi per contenitori di fluidi sterilizzabili.
US20040122414A9 (en) * 1997-09-22 2004-06-24 Hurst William S. Contoured tubing closure
US6083587A (en) 1997-09-22 2000-07-04 Baxter International Inc. Multilayered polymer structure for medical products
US6227359B1 (en) * 2000-03-13 2001-05-08 Russell D. Truluck Packaging of oil-coated cutting tools
US6555243B2 (en) 2000-06-09 2003-04-29 Ems-Chemie Ag Thermoplastic multilayer composites
US6500514B1 (en) * 2000-08-29 2002-12-31 Pechiney Emballage Flexible Europe Encapsulated barrier for flexible films and a method of making the same
DE10064333A1 (de) * 2000-12-21 2002-06-27 Degussa Mehrschichtverbund mit einer EVOH-Schicht
AU2002326492B2 (en) 2001-07-31 2008-07-17 Avery Dennison Corporation Conformable holographic labels
US6893672B2 (en) * 2001-09-07 2005-05-17 Pechiney Emballage Flexible Europe Peelable film and packaging made therefrom
CN1318096C (zh) * 2002-03-04 2007-05-30 株式会社吴羽 包装产品的热处理方法及经热处理的包装产品
US7217463B2 (en) 2002-06-26 2007-05-15 Avery Dennison Corporation Machine direction oriented polymeric films and methods of making the same
US8129450B2 (en) 2002-12-10 2012-03-06 Cellresin Technologies, Llc Articles having a polymer grafted cyclodextrin
US7166671B2 (en) 2002-12-10 2007-01-23 Cellresin Technologies, Llc Grafted cyclodextrin
US7385004B2 (en) 2002-12-10 2008-06-10 Cellresin Technologies, Llc Enhanced lubrication in polyolefin closure with polyolefin grafted cyclodextrin
US8148466B2 (en) 2004-05-24 2012-04-03 Cellresin Technologies, Llc Amphoteric grafted barrier materials
US20060210741A1 (en) * 2005-03-17 2006-09-21 Cryovac, Inc. Retortable packaging film with having seal/product-contact layer containing blend of polyethylenes and skin layer containing propylene-based polymer blended with polyethylene
US20060210744A1 (en) 2005-03-17 2006-09-21 Cryovac, Inc. Retortable packaging film with grease-resistance
US20060210740A1 (en) * 2005-03-17 2006-09-21 Cryovac, Inc. Retort packaging process and product utilizing high-temperature abuse layer and low-temperature abuse layer
US20060210743A1 (en) * 2005-03-17 2006-09-21 Cryovac, Inc. Abuse-resistant retortable packaging film having oxygen barrier layer containing blend of amorphous polyamide and semicrystalline polyamide
US20060210742A1 (en) * 2005-03-17 2006-09-21 Cryovac, Inc. Retortable packaging film with outer layers containing blend of propylene-based polymer and homogeneous polymer
KR101211458B1 (ko) * 2005-04-25 2012-12-13 어드밴스드 테크놀러지 머티리얼즈, 인코포레이티드 다층 라미네이트 및 분배 패키지와 저장 및 분배 방법
CN103121320B (zh) 2006-06-14 2015-06-24 艾利丹尼森公司 可顺应和可冲切的轴向定向的标签原料和标签及制备方法
CN101484315B (zh) 2006-06-20 2013-04-10 艾利丹尼森公司 用于热熔粘合剂标记和标签原料以及此种标签的多层聚合膜
US8105686B2 (en) 2006-07-17 2012-01-31 Avery Dennison Corporation Asymmetric multilayered polymeric film and label stock and label thereof
US20110189356A1 (en) * 2010-01-29 2011-08-04 Shy Brothers Farm Methods of Storing Cheese
ES2533684T3 (es) 2010-07-02 2015-04-14 Unilever N.V. Película de envasado flexible que comprende poliamida y poliolefina
US9676532B2 (en) 2012-08-15 2017-06-13 Avery Dennison Corporation Packaging reclosure label for high alcohol content products
WO2014207948A1 (fr) * 2013-06-24 2014-12-31 住友ベークライト株式会社 Film multicouche
JP2017520642A (ja) 2014-06-02 2017-07-27 アベリー・デニソン・コーポレイションＡｖｅｒｙ Ｄｅｎｎｉｓｏｎ Ｃｏｒｐｏｒａｔｉｏｎ 耐スカッフ性、透明性、及び順応性が改善されたフィルム
EP3476594A1 (fr) 2017-10-24 2019-05-01 Renolit SE Structure stratifiée pour emballage barrière biocompatible
EP3476593A1 (fr) 2017-10-24 2019-05-01 Renolit SE Structure de stratifié? pour emballage barrière

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2048775A (en) * 1979-05-11 1980-12-17 American Can Co Foodstuff Packaging Materials
US4284674A (en) * 1979-11-08 1981-08-18 American Can Company Thermal insulation
EP0035392A1 (fr) * 1980-02-29 1981-09-09 Mitsui Petrochemical Industries, Ltd. Produit multicouche laminé et son utilisation comme matériau d'emballage ou de construction

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4276330A (en) * 1976-10-22 1981-06-30 Crown Zellerbach Corporation Trilaminate film for forming sideweld bags
US4303710A (en) * 1978-08-16 1981-12-01 Mobil Oil Corporation Coextruded multi-layer polyethylene film and bag construction
US4308084A (en) * 1979-03-28 1981-12-29 Morton-Norwich Products, Inc. Process for preparing retort-proof metal layer laminates for packaging foodstuffs using aluminum hydroxide-modified copolymers as adhesives
US4355721A (en) * 1979-05-11 1982-10-26 American Can Company Package for food products
US4275119A (en) * 1979-10-05 1981-06-23 Mobil Oil Corporation Heat sealable packaging film comprising propylene polymer substrate and a surface layer blend of olefin copolymer or interpolymer
US4364981A (en) * 1979-12-28 1982-12-21 Union Carbide Corporation Three layer film having a core layer of low pressure, low density polyethylene
US4356221A (en) * 1981-05-15 1982-10-26 Union Carbide Corporation Melt-extruded multilayer polyethylene bag film
US4360551A (en) * 1981-06-19 1982-11-23 Mobil Oil Corporation Flexible film laminate especially adapted for use in the construction of a retortable food pouch
US4357376A (en) * 1981-07-06 1982-11-02 Union Carbide Corporation Multilayer film for primal meat packaging

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2048775A (en) * 1979-05-11 1980-12-17 American Can Co Foodstuff Packaging Materials
US4284674A (en) * 1979-11-08 1981-08-18 American Can Company Thermal insulation
EP0035392A1 (fr) * 1980-02-29 1981-09-09 Mitsui Petrochemical Industries, Ltd. Produit multicouche laminé et son utilisation comme matériau d'emballage ou de construction

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0176229A1 (fr) * 1984-08-23 1986-04-02 Toyo Seikan Kaisha Limited Récipient en polyester, multicouche, étanche aux gaz, étiré
EP0613774A1 (fr) * 1993-03-04 1994-09-07 Wolff Walsrode Aktiengesellschaft Feuille multicouche, adaptée à l'emboutissage, contenant du polyamide avec une résistance améliorée au perçage

Also Published As

Publication number Publication date
AU1734883A (en) 1984-02-09
JPS5981168A (ja) 1984-05-10
US4407873A (en) 1983-10-04
ES282208U (es) 1985-03-01
DK359483A (da) 1984-02-07
DK359483D0 (da) 1983-08-05

Similar Documents

Publication Publication Date Title
US4407873A (en) Retortable packaging structure
US4405667A (en) Retortable packaging structure
US4424256A (en) Retortable foil-based packaging structure
US4407874A (en) Sterilizable flexible packaging structure
US4640852A (en) Multiple layer films containing oriented layers of nylon and ethylene vinyl alcohol copolymer
US5093164A (en) Multiple layer packaging sheet material
EP0230115B1 (fr) Compositions synthétiques et pellicules; structures multicouches en feuille et emballages fabriqués à partir de celles-ci
US4966795A (en) Multiple layer sheet structures and package
US5110642A (en) Films using blends of polypropylene and polyisobutylene
US4818592A (en) Multiple layer films containing oriented layers of nylon and ethylene vinyl alcohol copolymer
US4892911A (en) Films using blends of polypropylene and polyisobutylene
EP1993835B1 (fr) Films d'emballage pour congélation/micro-ondes
EP0258527A1 (fr) Pellicule multicouche pelable
US5073599A (en) Films using blends of polypropylene and polyisobutylene
EP0321172B1 (fr) Méthodes pour la fabrication d'emballages en feuille multicouche.
JPH0737129B2 (ja) 多層フイルム
US8133560B2 (en) Multilayer heat sealant structures, packages and methods of making the same
GB2048775A (en) Foodstuff Packaging Materials
KR950004155B1 (ko) 포장용 다층 필름 및 이것으로부터 제조된 포장
EP0229476B1 (fr) Pellicules de polymères, procédé pour leur fabrication, pellicules multicouches et emballages fabriqués à partir des pellicules
US5154789A (en) Multiple layer films containing oriented layers of nylon and ethylene vinyl alcohol copolymers
US5165988A (en) Laminates and laminated tubes and packages
CA1325690C (fr) Melanges de polypropylene, et feuilles d'emballage fabriquees avec de tels melanges
US5006384A (en) Films using blends of polypropylene and polyisobutylene
US4547427A (en) Multilayer, sterilizable deep-drawing film

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT LI LU NL SE

17P Request for examination filed

Effective date: 19840825

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Withdrawal date: 19841026

RIN1 Information on inventor provided before grant (corrected)

Inventor name: KESTER, DENNIS E.

Inventor name: GENSKE, ROGER P.

Inventor name: CHRISTENSEN, RONALD C.

Inventor name: OSSIAN, WILLIAM F.